Molding machine



o ONSRUD 2,133,331

MOLDING MACHINE Filed Jan. 2, 1936 8 Sheets-Sheet 1 Inn 672 2'01 Oscar0125mm! M 7 Q I .Azzys'.

Oct. 18, 1938.

Oct. 18, 1938. Q. ONSRUD 2,133,331

MOLDING MACHINE Filed Jan. 2, 1936 8 Sheets-Sheet 2 Osman Onsrud Oct.18, 1938.- o. ONSRUD 2,133,331 MOLDQING MACHINE Filed Jan. 2, 1936 8Sheets-Sheet 3 .F" 3 1 121 l A 051 135 T, 29 j 61 It? weni'o r OsaarOrw'rud '0. QNSRUD' MOLDING MACHINE Oct. 18, 1938.

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MOLDING MACHINE Filed Jan. 2, 1936 8 Sheets-Sheet 6 Patented Oct. 18,1938 MOLDING MACHINE Oscar Onsrud, Chicago, 111., assignor to OnsrudMachine Works, Inc.,

tion of Illinois Chicago, 111., a corpora- Application January 2, 1936,Serial No. 57,242

2 Claims.

This invention relates to machines for making wood molding, dowels, theslats for Venetian blinds, lead pencils and other like products, whereinthe stock operated upon is cut length- 5 wise into various forms orstrips.

The purposes of the invention are, to improve machinery formanufacturing articles of the class mentioned, enabling close micrometeradjustments, in all directions, of the cutting tools for a high degreeof accuracy in the work and to make compensations for wear of the toolsand the sharpening of the tools, for example when a cutter becomesslightly tapered in the sharpening operation it may still be run true tocut grooves of equal depths such as required in the manufacture ofpencils; to provide convenience in the matter of operating upon stock ofvarious lengths, including a movable pneumatic feed unit having flexibleconnections to automatic control devices; to provide for quickly movingthe cutting units toward and away from the material operated upon in twodirections, and to a large extent without altering the micrometeradjustments; to provide improvements in feeding mechanism and guidedevices for insuring the correct movement and absence of vibration ofthe material operated upon; to provide for the prompt removal of cutaway material and to make numerous other provisions in the machine sothat it may continuously operate without much attention and maintainaccuracy in its products.

The purposes of the invention are accomplished by means of a machine asillustrated in the drawings, wherein- Figure 1 is a perspective view ofthe machine showing its front side and the discharge end thereof.

Fig. 2 is a perspective view taken at the opposite side of the machineto that from which Fig. 1 is taken.

Fig. 3A shows the machine in longitudinal section but partly brokenaway, the section being taken on the line 3-3 of Fig. 4.

Fig. 3B is a fragmentary continuation of Fig. 3A.

Fig. 4 is a transverse vertical section taken on the line 44 of Fig. 3A.

Fig. 5 is a fragmentary plan view of the machine, and partly in section,as indicated by the line 5-5 on Fig. 4.

Fig. 6 is a fragmentary sectional View taken on the line 6-6, Fig. 3A,and showing the construction of a stock feeding unit.

Fig. 7 is a fragmentary sectional detail taken on the line 1-1 of Fig.3A, showing guiding means for the strip stock which is fed through themachine, and means for adjusting the guide.

device vertically and laterally for accommodating stock of varyingdimensions.

Fig. 8 shows in longitudinal section pneumatic feeding mechanism.

Fig. 9 is a fragmentary longitudinal section which continues Fig. 8 toinclude valve control means for the pneumatic feed.

Fig. 10 is a modification view showing a guide element for engaging thesides of molding strips and like products to steady them as they leavethe cutters and are discharged from the machine.

This machine is designed to operate upon wooden slats having a maximumwidth of about four inches or less and of various thicknesses andlengths.

It receives a stack of such slats in vertical guides one of which isshiftable away from the other along an extension table.

The

slats are successively fed from the lower end of the stack through themachine and between the cutters and are by the cutters grooved above andbelow, rounded at their edges or otherwise formed according tovariations which may be required in the product of the machine.

For

example if it is forming pencils from strip stock the required hexagonalor round form of the pencil is determined by the type of cutting toolswhich are carried by the upper and lower cutting units.

The upper unit first grooves the adjusted rapidly up and down toward oraway from the cutting position a comparatively great distance and veryminutely.

Each cutting unit including its motor is likewise movable toward andaway from the working position sidewise of the machine.

Figures 1 and 2 show the relationship of the principal operating unitsof the machine and its supporting structure.

The base I supports a frame structure 2, which carries at its top arearwardly extending table arm 3 to which is attached an extension table4. Parts I, 2 and 3 are preferably cast integral.

A vertical or inclined stock supporting guideway 5 is movable to variouspositions along the table 4 to coact with a guideway 6 for receivingstrip stock of various lengths.

Attached to the adjustable guide 5 to move therewith is a pneumatic feedmechanism 1 including the horizontal slide 8, Fig. 9, but withoutstopping here to describe the feed mechanism it is first desired topoint out the main operating units of the machine in the order in whichthey receive the material operated upon.

Next in order to the feed mechanism which operates slide 8 is thecontrol therefor, comprising triggers 9, starting lever l0 and valveconstruction H operated thereby.

Next is a pair of feed rollers l2 and I3 which are ribbed on theirsurface as shown in Fig. 6. These feed rollers are driven by an electricmotor M through worm and changeable spur gearing I 5 contained withingear box I6.

Following the feed rollers 12 and [3 each strip of material such asindicated at I! slides along guide rail l8 against which it is held by aseries of resiliently mounted guide or stock rectifying rollers I9, Fig.3A, to beneath longitudinally grooved hold down shoes 20 adjacent thefirst and upper cutter 2|. This cutter is carried by spindle 22 which isa continuation of the armature shaft of an electric motor 23,.Fig. 4.

Next the. stock is operated upon by the lower cutter 24, which is drivenby an electric motor 25. The on and off switches for the three drivemotors are indicated at 26, Fig. l. The finished cut articles, such asdowel pins, enter the guide grooves in plates 25 and 2! on leaving thecutters prior to discharge from the machine'so that the material isfirmly held until the cut is finished. These plates are not separated asindicated in Fig. 1 while the machine is in operation, but the lowerplate may be moved down to position indicated in this View, togetherwith the lower cutting unit, by drawing lever 28 forwardly from theposition of Fig. 3A and the broken line position, Fig. 4 to the fullline position .Fig. .1.

The shavings from the cutters are continuously removed while the machineis in operation, by air suction devices attached to the machine at theair outlets 29 and 30, Figs. 4 and 1, but in case of faulty stock or acollection of wood fragments interfering with the operation of themachine, there'is a decided convenience in having the lower cutting unitmovable downwardly away from its cutting position. This is provided forby having lever 28, Figs. 3A and 4, rigid with cranks 31, whichoperate'the extensible links 32 having connection at their upper endwith the structure 33 upon which the lower cutting unit is mounted. Thiselevator member 33 has atop plate face normally contiguous with thehorizontal guide face on the main table part at the intake end (Fig.3A).

The shaft 34 which carries cranks 3| has its bearings in frame 2 andthis frame has the guides 55 for the movable frame structure 33. Thebracket 36 which carries the motor is further vertically slidable on theguideways 3'! on the movable frame 33 by means of a hand wheel 38.

Another feature of the cutting units and one of the generalcharacteristics of this machine is that the motors are tiltable on hingebolts 39 and 46 (Fig. 4) in order that they may be trued up horizontallyor slightly tilted to compensate for taper in the cutters. A tiltablesupport for the right-hand motor (Fig. 4) is indicated at 4|, adjustingscrew and locking screws at 42, 43 and 44.

The motor frame may also be drawn outwardly along guides 45 and 46 (Fig.5) on the support 4| by means of a lever 41 and link connection 48 tothe motor frame.

Thus the tool 24 may be easily reached and replaced. The inward motionof the cutting unit is limited by a micrometer screw .9 coacting Withstop 59 and clamps 5! are used for locking the unit in the operatingposition. A similar adjusting screw 49 and stop 56 are used for thecutting unit 2! (Fig. 4) which operates on the upper surface of thestock.

The foregoing description mentions the general arrangement and some ofthe principal mechanical features of the machine. The following isdetailed description of various operating units thereof, beginning withthe feed mechanism illustrated by Figures 3B, 8 and 9.

Feed mechanism The strips of stock which are to be cut to form areplaced between the channels 5 and 5, the flanges of the channel servingto retain the stock against lateral displacement. The channel 5 isadjustable along the table support 4 according to the length of thestock and is fastened against displacement by clamps 56. The slide frame51 to which channel 5 is secured supports the pneumatic feed mechanism 1which therefore is slidable along the extension table 4 with channel 5.The pneumatic feed mechanism 1 is connected with the fixed valve housingH by flexible tubes 58 and 59.

Figs. 8 and 9 show the feed mechanism as it would appear after the lastpiece of stock in the magazine therefor has passed through the machine.The triggers 9 then project through the table arm 3.

Air under pressure is supplied to the feed mechanism by conduit 58. Thisconduit has a branch 6! leadingto a hollow casting 62 (Fig. 8).

Formed within the casting 52 is a cylinder 63 1 within which fits apiston 64. The piston at its right-hand end is subject to the pressurewithin the casting and is thus normally forced toward its left-handposition as shown in Fig. 8.

Also supported uponpiston rod 65 is a piston 66 of larger diameter. Thispiston slides within a cylinder 6'! attached to the casting 62. Becauseof a larger area for piston 65, both pistons and the rod 85 to whichthey are fastened may be driven to the right when air at the samepressure as the air within casting 52 is admitted to the cylinder 67through conduit 58. The piston rod 65 also carries a slide valve 58controlling the four ports 69 to '52 inclusive.

With the valve in its left-hand position as shown, port 12 is opened,port H is closed and ports 69 and it are in communication at the pointof a recess 13 in the valve.

Under such condition the pressure within casting 62 is communicated toport 12 and the latter is connected by a U-shaped conduit 14 with a port15 in a cylinder lfi and located to the left of piston 11, The piston 11is clamped on a piston rod I8 to which is secured the stock feedingslide 8.

Accordingly as soon as air is admitted to the supply conduit 60, thepiston 11 is projected to the right end of the cylinder 16 (Fig. 8)carrying with it slide 8 which permits the slats to drop in guides 5 and6 so that when the piston is projected to the left, the lowermost slatwill be forced over into position to be engaged by the feed rollers I2and I3. To cause the piston 11 to make the feed stroke toward the left,it is necessary to admit air under pressure to the right end of cylinder15. The air is so admitted through a port I9 which, by conduit shown inFig. 2 as bent into U-form, communicates with port 69. This port asshown in Fig. 8 is cut off from the air supply within the hollow casting62, by valve 68. The valve in this position connects port 69 withexhaust port 10. Therefore, to cause a feed stroke of piston 11 it isnecessary to shift the valve 88 to the right so as to uncover port 69and close port I0. This can take place when the triggers 9 are up asshown in Fig. 9. At such time valve 82 is held open and valve 83 isclosed.

The air pressure in conduit 58 is communicated to conduit 59 through thepassageways 84, 85, 86, 81 and 88 in the valve body. Conduit 59 as shownin Fig. 8 transmits the air pressure to the large area piston 66 andthus the valve 68 is shifted to uncover port 69, cover exhaust port I0,and connect exhaust port H with port I2.

When ports II and I2 are in communication the air in cylinder I6 to theleft of piston I1 exhausts through the conduit 14 to port I2 then incommunication with the exhaust port 1 I.

When the valve construction 68 is thus shifted to the right Fig. 8, itis momentarily retained in that position by the dog 89, which springsover the end of nut on the end of the piston rod 65. The dog releases atthe end of power stroke of piston 11 when trip 92 at the right hand endof the piston rod I8 engages plunger 93. During the power stroke ofpiston 18 the strip of stock I! holds the triggers 9 down. At that timevalve 82 is closed and valve 83 is open. This permits the air underpressure between piston 66 and the head of cylinder 61 to exhaustthrough conduit 59 to the exhaust port 94 controlled by valve 83. Thefeeding operation is continuous and automatic so long as the triggers 9are alternately depressed and released by the stock passing thereover.If the magazine formedby guides 5 and 6 becomes emptied, the operationof the feeding mechanism stops, then, when the supply is replenished,the feed will not again take place until an operator first manuallycauses a depression of triggers 9 by swinging the handle I0 whichprojects through the side of the machine.

The corrugated feed rollers I2 and I3 which receive the strips of stockfed from the bottom of the magazine are continuously driven by motor I4,which is connected through the necessary gearing in the casing I6, Fig.6, with the roller I3. The casing I4 has a hinged cover to provideaccess to the gears I5 for speed changing purposes.

The shaft 96 to which feed roller I3 is secured, through the beveledgearing 91, drives a vertical shaft 98 to transmit motion throughbeveled gearing 99 to the feed roller I2. The spline I00 allows for upand down adjustment of the feed roller I2 without interfering with thedrive connection. Feed roller I2 ispressed down upon stock I! by springsIOI, which act between the bearing element I02 for roller I2 and anabutment I03 which is adjustable by means of screw I04 passing throughthe fixed frame structure I05. This frame is on the vertical guideshafts I06 for the roller bearing I02. Downward motion of feed roller I2is limited by a nut I01 carried by rod I08 passing through an ear onframe member I05 and secured at its lower end to the bearing I02. Theguide channel 6 as shown in Fig. 3-3 is carried by the bearingconstruction I02 being secured thereto by bolts.

The material leaving rollers I2 and I3 is guided along said guide railor fence I8 (Fig. 7) by side pressure rollers I9. The springs II8resiliently urge the rollers I9 into engagement with the stock. Thestock rectifying rollers I9 are carried by a slide II9, which may beadjusted sidewise in the guides I20 by screw I2 I. The frame structureI22 which carries the guides I20 is adjustable vertically along thefixed guide I22.I by hand wheel I24, which is fast to the threaded shaftI25 extending upward from the immovable frame structure 2. A guide plateI26 for engaging the top of the stock is carried by slide II9 throughscrews I21 and the stock is held between the plate I28 and a platen I28,Fig. 3A, which is movable up and down with the frame 33, Fig. 1, whichcarries the lower cutting unit.

The hold down shoes 20 previously mentioned, Fig. 3A, are locatedadjacent the cutter 2I which operates upon the upper surface of thestock. These shoes are resiliently held in engagement with the work bysprings I29, adjustment of which is effected by screws I30 in thevertical slide support I3I for the shoes.

The support I3I is retained in adjusted position by clamping gib I32,Fig. 5, which holds it in a guide channel I33 in casting I34 which isclamped to the fixed posts I23 and I35. The vertically adjustablesupport I3I also carries the conduit I36 through which material cut awayfrom the stock operated upon is expelled by blower means havingattachment to the outlet fitting 29. The adjustment of slide I3I, andwith it the shoes 20, is effected by hand wheel I31 on the top of screwI38, coacting with casting I34.

Cutting units The upper cutting unit 2| (Fig. 4) which cuts the uppersurface of the stock is adjusted downwardly to the cutting position byscrew I39 for which purpose the screw is provided with a hand wheel I40having micrometer markings on its periphery which are indicated by thepointer I4I. This unit slides in guideways I42 on the main framestructure 2.

The upper cutter 2| is leveled with reference to the stock operated uponor set at an angle thereto by means of. screws I43 and I44 which swingthe motor support I45 on the pivot 40.

The lock screws I43 retain the motor support I45 in its adjustedposition. These screws pass through slots M1 in the support to allow forits angular adjustment. The upper motor 23 and cutter thereon are movedlaterally away from the Work by means of hand lever I48 (Fig. 2) whichis connected to the motor frame by a link so that it may slide the motorsidewise within the ways provided for by the motor support I45. Themotor support is locked when the cutter is in working position by clampsI49.

The lower cutting unit 24 on the front side of the machine has similaradjustments which permit it to be shifted sidewise away from the work bymeans of lever 41 (Fig. 5) and to be tilted by the screws 42 and 43, andto be vertically ad justed by means of the micrometer screw wheel 38 toregulate exactly the depth of. cut; but is likewise movable as a unit acomparatively long i distance downwardly through operation of lever .inggibs II engaging the angle rail or dovetail slide I52, carried at thesides of frame 33.

The grooved guide block 27 may be finely adjusted vertically withreference to the structure 33 by means of wheel I53 whereby the supportI54 for block 27 is moved in the guides I55. Guide block 2! is carriedby a plate I56 which may be adjusted lengthwise of the machine by adovetail connection with the support I54.

The upper grooved guide 26 is likewise adjust- .iable lengthwise alongits dovetail connection with its support I5! (Fig. 4) and the latter maybe adjusted sidewise along the T-slot I58 (Fig. 2) in the supportingcasting I59 therefor. The casting in turn is mounted for verticaladjustment along the fixed guides I38 and by means of a hand wheel NH.

The operator has control of. the three driving motors through the switchbuttons 26. The necessary relays and other automatic electrical.;control devices are housed within a casing IE2 at the rear of themachine and provided with cover I53, (Fig. 2).

Fig. is a detail to illustrate provision for a different type of guidedevice than that indicated by the numeral 2?. For example, when themachine is used for cutting moldings, a

side guide is used in place of member 2'! and this guide IE4 is adjustedalong the diagonal way I65, (Fig. 1).

Operation thereof and the material passing through the machine andwithout interfering with any of the fine adjustments. Thus if there isreason to reach the work in process, lever 28 may be drawn forwardly andin this Way lower the vertical slide frame structure 33, together withthe front cutting unit, platen I28 and the guide 21. The micrometersetting of the tool or guides is not necessarily changed. Likewise thecutting units may be shifted sidewise away from the work by means of thelevers 47 and I48 but when returned to working position, will be stoppedaccording to the setting of screws 49 and 53.

In using the machine, the strip stock is fed thereto through the guidechannels 5 and 6 and although all of the motors may be in operation,

wardly in the channels 5 and 6. The reciprocation of the slide plate 8successively acts on the strips of stock in the magazine and feeds thelowermost one to rollers I2 and I3.

The downward swinging of the triggers 9 allows air from the left-handend of cylinder 61 ,to exhaust by valve 83 through the outlet port 94.Thus the pressure of air from the supply conduit 69 is effective withinthe hollow casting 62 to drive the pistons 64 and 66 to the left (Fig.8) and position slide valve 68 as shown in this figure. In this positionof the valve air may pass through the port I2 into the conduit 14 to theleft of piston TI through the port 15. Piston Ti and feed slide 8 arethus carried to the right.

Upon release of handle I0 (Fig. 9) spring I66 restores the triggers 9 totheposition shown in Fig. 9 and thus reverses the setting of valves 82and 83. Valve 82 is then open and valve 83 closed as shown in thisfigure.

The compressed air in supply conduit 50 then passes along conduit 58 tothe valve chamber 85, past valve 86 and into valve chamber 81 and fromthere through conduit 59 communicating the pressure to the left end ofcylinder 61. Pistons 66 and 65 are then driven to the right against thepressure within the hollow casting 62 and retained by dog 8. The slidevalve 68 is thus positioned to cut off port I2 from the chamber formedby casting 52 and connect this port with outlet II.

Thus the air may exhaust from the left-hand end of cylinder 18 while thecompressed air enters port 69 and from there is conducted by conduit 80and port 19 to the right-hand end of cylinder i6. Piston I1 is thusdriven to cause a feed stroke of plate 8. At the end of the stroke,screw 92 engages plunger 93 and trips the dog 89.

Piston rod 65 is then free to shift to the left and does so as soon asthe strip of stock engages the triggers 9 when the valves 82 and 83 areagain reversed, permitting the air from the left of cylinders 61 toexhaust through conduit 59 and outlet port 94. This cycle of operationis continuously repeated so long as there is a supply of stock withinthe magazine formed by guides 5 and 6.

The feed rollers 52 and I3 are driven continuously, forcing the stockalong the guiding and steadying devices previously described andconsisting of side rollers I9, pressure plate I21 and the hold-downshoes 20, all cooperating with the platen I28 and fence I8 to preventvibration or incorrect travel of the stock during the operation of thecutters 2| and 24, (Fig. 3A).

The finished articles or formed molding, when leaving the cutters passbetween the guiding devices 26 and 21 which are specially formedaccording to the nature of the product and steady the same while thecutters complete their work. The unfinished articles eject the finishedones from the left end of the machine, Fig. 1.

I claim:

1. A molding'machine of the kind described comprising a frame, aguideway therein, means to feed stock to be operated upon along saidguide- Way, cutters oppositely mounted adjacent said guideway one beforethe other to operate on opposite sides of the stock as it passes saidcutters, means to vary and adjust convergence of said cutters relativeto the path of the stock, and setting means for tilting the cuttersrespectively to adjust positioning of the cutting edges relative to thework and to compensate for cutting edge wear, said cutters havingsupports tiltably mounted on horizontal axes transverse of the cutter,axes tofore the other to operate on opposite sides of flat parallelfaced stock as it passes said cutters, means to vary and positivelyadjust convergence of said cutters both vertically and horizontallyrelative to the path of the stock, and setting means for tilting thecutters respectively to adjust and maintain horizontal positioning ofthe cutting edges relative to the Work and to compensate for tool edgewear.

OSCAR ONSRUD.

